Hijacking the wp.customize set & get methods for settings

( function( api ) {

	/**
	 * Set the value and trigger all bound callbacks.
	 *
	 * @since 1.0
	 * @param {object} to New value.
	 */
	api.Value.prototype.set = function( to ) {
		var from = this._value,
		parentSetting,
		newVal;

		to = this._setter.apply( this, arguments );
		to = this.validate( to );

		// Bail if the sanitized value is null or unchanged.
		if ( null === to || _.isEqual( from, to ) ) {
			return this;
		}

		this._value = to;
		this._dirty = true;

		this.callbacks.fireWith( this, [ to, from ] );

		return this;
	};

	/**
	 * Get the value.
	 *
	 * @return {mixed}
	 */
	api.Value.prototype.get = function() {
		return this._value;
	};
} ( wp.customize ) );